Condition types not showing in PO

Hi all,

I noticed that some condition types don't show on Purshasing order ( CU00, CUFR, CUPZ, CUDL and all Condition types relation to customs).

Even when I maintain these condition types in MEK1, I still can't find them in PO.

What can be the problem? Am I missing something?

P.S: I am using RMIMPO as pricing procedure.

Thank you.